[time-nuts] 50th Anniversary of the Atomic Clock

[Poul-Henning Kamp]

In message <42EE6805.50508 at pacific.net>, Brooke Clarke writes:

>I've been reading some of these articles and notice that NBS started 
>work with Cesium standards around 1948, yet it was the Essen standard at 
>NPL in the UK that seems to be the important one.  I take it that this 
>means that Essen's standard worked much better, but how was his 
>different from the NBS standard?

I belive it was the choice of atoms that made the major difference.

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